1 RM

The 1 RM calculator allows you to calculate your maximal strength in a given exercise based on the number of repetitions you can can perform with a submaximal load.

Instructions:
1. Pick a weight you can maximally lift 1-12 times.
2. Lift the weight for as many repetitions possible and enter weight and number of repetitions.
3. The top panel shows the estimated RM-values. 1 RM is the maximal weight you can lift 1 time. 2 RM is the maximal weight that can be lifted 2 times, etc.

1 RM

2 RM

3 RM

4 RM

5 RM

6 RM

8 RM

10 RM

12 RM

15 RM

lbs

00.0

Repetitions

Weight

lbs

143

Background
One RM is defined as the maximal weight that can be liftet once with good form in a given exercise. Two RM is the maximal weight that can be lifted two times etc. By knowing the maximal weight you can lift a given number of repetitions, you can estimate the maximal weights that can be lifted any other number of repetitons (within limits).

Reference
Brzycki, M. Strength testing: Predicting a one-rep max from a reps-to-fatigue
Journal of Physical Education, Recreation and Dance 64 (1): 88-90, 1993.